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What force is necessary to lift a rock weighing 150 kg by using a bar that is 2.0 meters long if the fulcrum is placed 30 cm from the point where the bar contacts the rock?
Wiki User
∙ 12y ago
Total length of the lever = 2 meters = 200 cm
Length of load arm (fulcrum to rock) = 30 cm
Length of effort arm (fulcrum to effort-point) = 200 - 30 = 170 cm
Mechanical advantage = effort arm/load arm = 170/30
Weight of the rock = Mass x gravity = 150 x 9.8 = 1,470 newtons
Effort = weight/M.A. = 1,470 x 30/170 = 259.4 newtons.
(That's the apparent weight of 26.47 kg of mass.)
Wiki User
∙ 12y ago
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